国家级自然保护区小陇山白皮松群落生态位研究

采用定量分析方法,对小陇山林区白皮松群落中8个主要种群进行了生态位研究。结果表明：主要种群生态位宽度值大小顺序依次为：白皮松、黄栌、狼牙刺、侧柏、秦岭海桐、野花椒、灰木紫宛、栓皮栎;白皮松种群为优势种群,黄栌、狼牙刺则为次优势种群,其余为常见种群或偶见种群;群落具有单优势种群并兼具多样性和复杂性的特点。生态位重叠程度较低,在0～0.16（Lih）和0～0.14（Lhi）之间波动,各种群对生境资源的分享充分,各物种间竞争较小,群落相对稳定。生态位相似比例在0.5以上的种对有12对,占42.9%。各种群对资源利用的相似程度较大,群落内的生境相对单一;白皮松种群与生态位宽度值高的种群对生境需求的相似性较大,而与生态位较窄的种群相似程度小。

Study on the niche of Pinus bungeana community in Xiaolong Mountain National Nature Reserve

The niches of 8 main tree populations in Pinus bungeana community were studied by a quantitative method at the Xiaolong Mountain National Nature Reserve.The order of niche width of these populations were Pinus bungeana,Cotinus coggygria,Sophora viciifolia,Biota orientalis,Pittosporum rehderianum,Zanthoxylum simulans,Aster poliothamnus,Quercus variabilis.Pinus bungeana was the dominant population,Cotinus coggygria,and Sophora viciifolia were the subdominant populations,and other species were the common and r...